Oscillating steam-balanced valve.



I WMe/.50%

No. 884,362. v PATBNTBD APR-14, 1908.Vv

- J. H. BURNHAM.

' 'OSGILLATING STEAM BALANGBD VALVE.

APPLICATION FILED MAY 17. 190,7.

nnnnnnnnnn-w. lll/ll N- JOHN H. BURNHAM, OF UNIONTOWN, PENNSYLVANIA.

OSCILLATIN G STEAM-BALANCEI) VALVE.

Specification of Letters Patent.

Patented April 14, 190s.

Application filed May 17, 1907. Serial No. 374,165.

To all whom it may concern.'

Be it known that I, JOHN H. BURNHAM, of Uniontown, county of Fayette, and State of Pennsylvania, have invented an Inprovement in Oscillating Steam-Balanced alves, of which the following is a specification.

My invention has reference to oscillating steam balanced valves and consists of certain im rovements which are fully set forth in the fbllowing specilication and shown in the accompanying drawings which form a part thereof.

The objects of my invention are to provide a construction of oscillating steam valve which shall embody balanced qualities and great simplicity of construction; and also to secure durability against wear and small cost of construction.

My invention consists of a valve casing or chest containing steam ports adapted to lead to the ends of the cylinder, combined with an oscillating valve seated in said casing and having axial ports arranged in the line of its axis of oscillation for su plying steam or other motive fluid to the va ve and conveying away the exhaust steam or fluid and further having in its body a central -steam port extending entirely through the valve communicating with one of the axial ports and two lateral exhaust Orts one on each side of the steam port and in communication with the other axial ort.

My invention also compre ends details of construction which, together with the features above s ecilled, will be better understood by re erence to the drawings, in which* Figure 1 is a sectional plan view of an oscillating steam balanced valve embodying my invention, taken on line 1 1 of Fig. 2 Fig. 2 is a sectional side elevation of the same taken on line 2*2 of Fig. l; Fig. 3 is a vertical longitudinal sectional elevation of the same taken on line 33 of Fig. 2; and Fig. 4 is a diagrammatic perspective view illustrating the relative arrangement of the steam ports and passages in the oscillating portion of the valve. v

A is the base and B the cap of the valve casin or chest and these are bored out transverse as at C, for reception of the valve proper. This casing is preferably counterbored, as at G, so as to hold the valve F against longitudinal movement, while permitting of oscillation.

The base A may constitute a part of the cylinder of the engine or be bolted thereto and is provided with the two steam ports E E at a short distance apart. The cap B is bolted to the base A by cap screws D. By removal of the cap, the valve F may be Withdrawn.

F is the oscillating valve and consists of a large cylindrical body portion working inthe countenbored casing or chest.4 It has necks H at each end which extend beyond the casing and are provided with stuffing boxes N. Fittinoi into these necks and held therein by suitable packing in connection with the stuff'- ing boxes, are the inlet flanged tube M and the exhaust or outlet flanged tube L. These tubes M and L are adapted to be connected respectively with the steam and exhaust pipes leading to and from the engine.

The valve body is provided with a central steam port I which extends. entirely through the body, as indicated in Figs. 2 and 3, so that steam which enters the said port from the flanged tube M is adapted to exert its pressure upon the base A and the cap B on diametrically opposite sides of the valve body during its oscillation. In this way, the said body is practicallyV balanced, and consequently, is very free to oscillate and obviates material friction on any particular ortion of the casing. The body F of the va ve is also provided with exhaust ports J J respectively upon opposite sides of the central steam port, but the exhaust ports open through the cylindrical surface of the valve body on the lower portion only, as shown in Fig. 2. One end of each of the said ports J J is connected by a transverse steam chamber J 2 as shown in Figs. l and 3, and this communicates with the flanged exhaust tube L. The general arrangement of these orts, tubes and steam passages is illustrate diagrammatically in perspective in Fig. 4.

When the valve is in the position shown in Fig. 2, steam passes from the steam port I of the valve body through the steam ort E of the base A and may be conveyedp to one end of the cylinder of the engine. The exhaust steam from the other end of the cylin der passes by the port E in the base A to the exhaust port J on the valve body, thence by the steam passage J2 into exhaust tube L. When the valve body F is oscillated so as to bring the steam port I into alinement with the steam port E, the steam will be supplied through port E to the opposite end ol'A the cylinder to which it was before supplied, and the steam from said end will be 'exhausted by the exhaust -port J During the oscillation ofthe valve body, in its passage between the steam ports E E, the steam lpressure will be exerted equally upon the cap B and the base A of the chest or casing and will not exert undue pressure upon the valve body itself-to Jforce it against either the cap B or the base A. When the port I is in a vertical position as indicated in Fig. 3, it is seen that the steam in the port I will exert equal pressure above and below the valve, so that the valve is in e'fl'ect, balanced.

rIhe lever K may be secured to one of the necks H of the valve body for oscillating it, said lever being connected with an eccentric, cam portion or other movable part of the engine, as found desirable.

While my valve is especially designed Jfor steam engines, it is evident that it may be used for various other types of machines Where steam or other Huid is required to be controlled, whether rapidly or slowly. It is evident that the valve herein shown might be excellently ad aptedffor rock-drills, whether operated by steam or compressed air.

Among the advantages of my improved valve, I would point out the following:- It is a free and easy working valve; the

r chest or casing being made in two parts will allow of taking up for the wear of the valve to avoid leakage; the valve body has no material pressure on it, either to wear the valve or the casing, the resistance or work put upon the eccentric or operating part of the engine is very light and obviates material wear or breakage of that mechanism; the exhaust ports permit free and ready escape of the exhaust steam 3 the valves can be quickly and easily dismantled. for cleaning or other purposes, and lubrication may be easily maintained because of the balanced nature of the valve.

The details of construction may be modiiied without departing from the principles of the invention Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an oscillating balanced valve, a casing having a transverse cylindrical aperture and two steam ports opening into the face of the said aperture for res ectively supplying steam to the opposite sir es of the piston of the engine, combined with an oscillating cylindrical valve body fitting said aperture and having a steam port extending transversely through it so as to open on diametrically o posite sides and provided with a steam inlbet through the axis of the valve so that the steam or other medium may exert no material pressure upon opposite sides of the valve body and also having inclosed exhaust ports upon opposite sides oi' the steam port and opening through the face of the valve body closer to one of the steam port openings than to the other.

2. In an oscillating balanced valve, a casing having a transverse cylindrical aperture and two steam ports opening into the Jface of the said aperture or'res ectively supplying steam tothe opposite sic es of the piston of the engine, combined with an oscillating cylindrical valve body fitting said aperture and having a steam port extending transversely through it vso as to open on diametrically opposite sides and provided with a steam inlet through the axis of the valve so that the steam or other medium may exert no material pressure upon opposite sides of the valve body and also having inclosed exhaust ports upon opposite sides of the steam ort and o ening through the face of the va ve body c oser to one of the steam port openings than to the other, stationary tubes arranged concentric with the axis of the valve for supplying the steam to the steam port and from the exhaust ports of the valve body in an axial direction with respect to the valve body, and means for forming a tight joint directly between said tubes and valve body.

3. In an oscillating balanced valve, a casing having a transverse cylindrical aperture and two steam ports opening into the face of the said aperture for respectively supplying steam to opposite sides of the piston of the engine and formed of a base and cap detachably secured together on a lane through the axis of the valve, combinedD with an oscillating cylindrical valve body iitting said aperture and having a steam port in the form of a slot extending transversely entirely through it so as to open on diametrically opposite sides and provided with a steam inlet through the axis of the valve so that the steam or other medium may exert no material pressure upon opposite sides of the valve body and also having exhaust ports upon o posite sides of the steam port and opening t rough the face of the valve body.

4. An oscillating valve body formed of the cylindrical portion F having a neck H at each end provided with a stuffing box and also having a central steam port I extending entirely through the body and o ening axially through one of the necks anc two exhaust ports J J connected by a passage J 2 opening axially through the other neck.

5. An oscillating valve body formed of the cylindrical portion F having a neck H at each end provided With a stuffing box and also having a central steam port I extending entirely through the body and opening axially through one of the necks and two exhaust ports J J connected by e passa e J 2 openin axially through the other nee combine With the flanged su 1y and exhaust tubes Witnesses:

M L held by the stuiil boxes, and a casing WM. C. BLACK, in Which the valve bo y is sleeved having 1 `WM. JONES.

ports E E With Which the ports I J J of the 10 valve are alternately brought into alineinent.

In testimony of Which invention, I have hereunto set my hand.

JOI-IN H. BURNHAM. 

